trebling

Their profits have trebled in the last two years.

最近两年他们利润增加了三。

After uncovering of treble part we see valves underlaid by felt.

在揭露高音部分以后我们看见毛毡支持阀门。

If the British were as bountiful as the Americans,donations to charities would more than treble.

如果英美那样慷慨,那么给慈事业捐赠将超过现在3。

It's value has trebled.

价值已增长到原来三。

His salary is treble mine.

他工资是我三。

They exist in four sizes: treble, tenor, bass, and double bass (violone).

高音、次中音、低音和双低音（低音提琴）。